11 īīDiagnostics / troubleshooting GNSS diagnostics
been tracking RTK corrections for some time.
l Move away from trees and obstructions to initialize. Once initialized, approach the obstructed
area again. If the obstructions are severe, GNSS positioning may not work in that area.
l Because the GNSS satellites move, there may be times of the day when you are working in an
area with obstructions.
Not tracking RTK corrections
The radio link is down or intermittent. Ensure that:
l The line-of-sight between the base and rover receivers is not obstructed.
l The rover receiver is within range of the radio.
l The radio power supply is on.
Poor signal / not receiving a clear signal
l Interference from 2-way radios
Transmitting FM 2-way radios can interfere with OmniSTAR, WAAS, and GNSS signal reception.
Make sure that there is at least 1 m (3 ft) between the FM 2-way radio antenna and the
receiver.
l Vehicle issues
An unshielded ignition system can cause enough noise to block reception of a differential
signal. Use resistor spark plug wires on the vehicle ignition system.
An alternator can cause noise that interferes with a differential signal.
Note ā Before replacing engine parts in an attempt to solve this problem, make sure that the
problem is not caused by a computer or power source near the receiver. Some computers and
their power sources cause noise that disrupts GNSS and satellite DGNSS signals.
Possible solutions include:
l
l Use bypass capacitors, commonly available in automotive stores for cleaning up
interference to CB and other radios. If the problem persists, shield engine components
with aluminum foil.
l Relocate the antenna on the machine. Determine the optimal antenna location.
l GNSS receiver issues:
l
l Mounting location: The receiver may not be picking up a clear signal due to mounting
location. Mount the receiver on the centerline of the vehicle, away from any sources of
interference and with a clear view of the sky.
l Cable problems: Use an ohmmeter to check the cable. The resistance of a good cable
between connector pins at each end of the cable is zero. If the cable is sound, but the
320 TMX-2050 Display User Guide Version 1.075, Revision C
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